feat: Prefer room keys with better SenderData when comparing duplicate room keys

[poljar]

This if a first attempt at addressing #3703. This isn't a full fix, but should address the most common case where the same room keys are received but contain different authenticity properties due to being received from different sources.

A more complete solution will need to utilize the InboundGroupSession::merge() method.

[codecov]

Codecov Report

Attention: Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.

Project coverage is 84.50%. Comparing base (322c5b3) to head (6fb73ac).
Report is 24 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/matrix-sdk-crypto/src/machine/mod.rs	50.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4040   +/-   ##
=======================================
  Coverage   84.50%   84.50%           
=======================================
  Files         266      266           
  Lines       28475    28481    +6     
=======================================
+ Hits        24062    24068    +6     
  Misses       4413     4413           

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[bnjbvr]

Rust code looks good, and the crypto logic sounds sensible. Thanks!